I subscribe to Qantas Red e-Mail for deals ex-SIN and received the "Business Class Sale to Australia from just S$2488*" on 12 December. At that time I didn't examine it closely but SIN-BNE return for S$2,488 seems like a good deal, compared to Premium Economy (S$1,982 not on sale), PER for $2,688 and MEL/SYD above S$3200...
Book by 31 December 2013 for travel until 31 March 2014.